UE Physics & Collision

Target engine: UE 5.8. APIs below are verified against the 5.8 headers; older forms are listed under "Deprecated — do not use".

Collision and physics live in the Engine module (UPrimitiveComponent, UWorld queries, FHitResult, UCollisionProfile) and the PhysicsCore module (FCollisionShape, UPhysicalMaterial, FBodyInstanceCore, ECollisionTraceFlag, EPhysicalSurface). The simulator itself is Chaos (Chaos / ChaosSolverEngine modules); destruction adds GeometryCollectionEngine and FieldSystemEngine. Most gameplay code only needs "Engine" and "PhysicsCore" in Build.cs.

Context

Read .agents/ue-project-context.md if it exists (module names, conventions, enabled plugins, GAS/networking setup). Do not stop if it is missing.

Identify the area from the request and the codebase. Ask only when two plausible readings would produce different code.